Fixes #147
Preparing MyBB 1.6.12
Fixes #182 Group membership failure
Fixes #184 Changing Theme doesn't work
Remove incorrect sentence from language string

The page doesn't actually redirect the user. This area could be improved.
Remove <script> for popup_menu.js.

popup_menu.js no longer exists in 1.8.
Update JS cache breakers
Extra number formatting for attachment count
Initial focus upon opening modal
Remove index_loginform template.

This has been replaced with a modal.
Remove stray <br />

This was pushing the registration form down.
Add table header to latest news table.
Javascript consistency
Fix borked error language string

This was weird...
Prevent users registering using their username/email as their password.
Show user avatars by default to guests
Minor, code clean up
Merge branch 'feature' of https://github.com/mybb/mybb into feature

Conflicts:
	install/resources/mybb_theme.xml